Thermostatic regulation for heated rollers.



UNITED STATES raTENT OFFICE.

GEORGE S. WITHAM, SR.,' OF HUDSON FALLS, yAND ALFiRED-.ROESCIL OF NEW YORK. N. Y., ASSIGNORS TO CHARLES II'IAYGLIABUE MANUFACTURING CO.` OF BROOKLYN,

N. Y., A CORPORATION OF NEW YORK.

THERMOSTATIC REGULATIONTOR HEATEDROLLERS.

specification of Letters raient.

Patented Aug. 1.8, 1914.,

Application filed January 15, 1913., Ser1alNo. 742,119.

To all whom it may concern:

Be it known that we, Gannon S. lVrrnAM,

Sr., a citizen of the United States, and resident of Hudson Falls, county of Washington, and State of New York, and Anraat) leasen, a citizen of the United States, and resident of Brooklyn, county of Kings, city and State of New York, have invented certain new and useful Improvements in Thermostatic Regulation for Heated Rollers, of which the following is a specification.

Our invention relates to the thermostatic control ofcalender rollers of various kinds where it is essential forthev'best results, to maintain the rollers at a substantially uniform temperature. The calender rollers used in the preparation of sheet rubber,gutta pcrcha and paper are of this character and should be maintained at a constant temperature.

In the manufacture of paper where, to properly dry the paper, it is necessary to pass it between a pluralit)r of uniformly heated calender rollers, any failure to maintain suc-l1 rollers at the required const-ant temperature becomes apparent by the rupture of the continuous sheet of paper 0r by the production of defective, moist, and unsalable stock. The result in either case is a severe loss to the manufacturer both in stock and in loss of time, when of necessity the machines must remain idle until the proper conditions are restored. Many mechanical devices have been tried in connection with the calender rollers used in paper manufacturing machines, in an attempt to obviate the difliculties and decrease the loss, but as such devices usually depend upon the condition of the product for control of the temperature of the rollers, the temperature thereof will vary widely above and below the desired temperature, tlms resultin,c r in a lack of uniformity in the product and the frequent losses above referred to.

Wit-h a view to obviating the above diiiiculties and as comlucive to the manufacture of a. uniform product` the object of our invention is to regulate the teu'iperature of the rollers by direct means depending upon the actual temperature of the roller. Since this control is entirely independent of the condition of the product and the temperature of the rollers is maintained substantially constant the paper will be turned out practically uniform and Without defects. and there .will be no loss from breakdown or defective material.

i' W'e have found that the temperature` of two or more rollers may be regulated satisfactorily by a simple sensitive member placed in position to be affected by the temperature ofone of the rollers which will thus control the steam flow to the two or more rollers.- Such an arrangement is illustrated iu the accompanying drawings in which' Figure 1 Vshows two calender rollers controlled by a sensitive member in vone of them,

shown partially in section, and Figs. 2 and 3 indicate a modified sensitive 'member and its relation to the roller.

ln the drawings 1 represents `a revoluble calender roller ot' the character usually cm-A ployed in the nmnufacture of papers Two series (l, 1) of such rollers are embodied iu a. complete machine, oneseries being above the other, the continuous sheet of paper beingr dried by passing itz-between the rollers. The rollers are heated, and vtoproperly dry the papershould be maintained at a' predetermined constant temperature. In the present instance the rollers are adapted to be heated by steam from a main steam pipe 2. which by a suitable coupling is connected with the valve 3 which is adapted to regulate the admission of steam to two rollers, one above the other as indicated. Steam passing the valve 3 enters the pipe si and from there by brunch pipes 5 enters the rollers l, l axially through the tubular trunnions of the respect-ive rollers. 'lhe end of the trunnion is screw-threiuled to receive the usual hollow smiling-box nut i'V which renders the joint between the pipe- 5 and the trunnion G,

steam tight but. permits rotation ofthe roller. The pipe 5 is of sufiicicntly large diameter to admit. the necessary steam about a smaller return pipe 8, indicated in dotted lines as passing into 'the roller and terminatingr near the inner bottom surface of the roller therehv permitting the steam to circulate and the condensed water to escape.

'lhu pipes S are secured iu place by special couplings E) through which they pass and are connected with a couunon return pipe l0, in the usual manner. 'lhe rollers arc suitably mounted to rotate in bearing blocks 1l and may be rotated` in any suitable manner as, for instance, a pulley 12 may' be secured to the trunnion 6 and adapted to drive the roller 1 which in turn will drive the roller 1 by means of the. intermeshing gears 13.

The problem heretofore has been to propcrl)vv control the flow of steam so as to mailitain thc rollers at the constant temperature rcouircd for proper drying of the paper. For this purpose our invention contemplates the thermostatic control of the temperature of the revcluble rollers. Any suitable thermostatic controlling device may be employed but the type of device here shown is similar in structure and operation to that shown and described in Letters Patent No. 920,883 of Muy l, 1909, to 7. J. Ruff'. In Fig. l the right hand end of the roller l, shown in section` is shown as provided with a tubular trunnion 14, fitted with a stufling box cap 15 which is adapted to form a steamtight joint about the tubular stem 16 which is provided at its inner end with a sensitive bulb or member 17. The sensitive member may be filled with ether or other volatile fluid sensitive to heat,` the expansion of the vapor of which through an extension 19 of the tubular stem 16 is adapted to control the usual air pressure (,'ontrolling device such as shown in the Ruff patent above identified. A. complete description of this device, which is well known in the art, is considered unnecessary. The dial 20 is intended to enable. the device to be set at the predetermined temperature required for the roller 1. It will be understood that when the temperature rises above the normal, the sensitive member 17 will be accordingly affected and through the pipe 16, 19, is adapted to admit compressed air from the pipe 21 into the pipe 22. The pipe 22 communicates with the usual diaphragm cell on the end of the valve stem of the steam valve 3 thereby permitting the valve to be closed by air )ressure. It' the temperature of the roller rops below the normal the sensitive member 1'( will cause the. compressed air to be cut ofi' and the air in the pipe QQ to exhaust as the valve 8 is lifted by the usual sprin r 3, thereby turning the steam into the rol ers which will soon restore the temperature to normal. Thus while the rollers are permitted to rotate in the usual manner the temperature thereof will be maintained substantially constant, as required. The tubular stem 16 of the sensitive member passes through the tubular trunnion l-i and is preferably supported bv a bracket 23, secured to the bearing bloc( l1. A suitable clamp 24 is carricd bv the bracket 11 for holding the stem 1G and the sensitive member 1T from turninr with the roller 1.

t will be understood that the sensitive member may be supported in various positions to obtain the desired temperature control of the roller. In Figs. 2 and 3 is shown a modification in which the sensitive" member 25 is made in the shape of a segment of a cylinder and adapted closely to fit the curvature of the outside of the revolublc calender roll. bracket .26 of suitablc sha )e is sccurcd to thc bcaring block ll und al aptcd to hold thc scnsitivc mcmbcr substantially in contact with the roller, as indicated. The sensitive mcmbcr 25 is provided with a stem 2T which is' adapted to communicate with the usual compressed air controlling device above referred to.

Various modifications of the specific details may be made without departing.r from the spirit and scope of the claims.

lVe claim:

l. ln a device for thc purpose specified a revoluble calender roller, means for hcatiug the same. with a fluid, a sensitive thermostatic member adapted to he afl'ected by the temperature of' the heating fluid in said roller, and means controlled by said sensitive member for controlling the flow of heating fluid to said roller whereby the roller is maintained at a uniform temperature.

2. ln a device for the purpose specified a revoluble calender roller, means for heatingr said roller with a fluid, a sensitive thermostatic member adapted to he aflected by the temperature of thc heating fluid in said roller` means for supporting said sensitive member in position to bc affected b v the temperature of the heating fluid in said roller, and means controlled by said sensitive member for controlling,r the flow of heating fluid to said roller whereby the roller is maintained at a uniform temperature.

il. In a device for the purpose specified, a revoluble calender roller. bearing blocks therefor, means for heating said roller with a fluid. a sensitive thcrmostatic member adapted to be afl'cctcd by the tennwraturc of the heating fluid in said roller, means secured to one of said bearing blocks for supporting said sensitive member in position to be ufl'ected bv the temperature ol the heating fluid in said roller and adapted to prevent rotation thereof with the roller, and means controlled b v said sensitive member for controlling the. flow of heating fluid to said roller, whereby the roller is maintained at a uniform temperature.

4. ln a device for the purpose specified a revoluble calender roller provided with tubular hearing,T trunnions, bearing blocks therefor, steam pipe connections through the tubular trunmon at one end ofl the roller for admitting steam for heating said roller, a sensitive thermostatic member located within the roller and adapted to be afl'cctcd by the temperature of the steam in said roller` said member having a tubular exten sion passing through the tubular trunnion at the other end of said roller, means for peupportin said sensitive member` within the ro ler :in means connected. with and von` trolled by Snid'sensitive member lfor controlling the flow of steam to: said roller 5 whereby the roller is maintained at a uniform temperature. 4

5. In n device for the purpose speeifed arevoluble calender rollerprovided with tubuhi r ben rin,r tronnions,'beurng blocks therefor,

tivel member, said joint being adapted to permit rotation of said roller, means secured to one' of said bearing blocks for supporting seid sensitive element within the roller nndnd'apted to prevent rotation thereof with 25 theroller, and menns'controlled by sind sen- {sitivemember for controlling the'ow of Steam' tol said roller whereby the roller is maintained at u uniform tem ieruture.

In ',testimonywhereof we ave hereunto 30 set 'our hands ,inl` the presence of two subscribing witnesses.

' GEORGE S. WITHAM, SR.

. ALFRED ROESCH.

tiles-ses for. Vithnni:

\V.' H'.' *NE1LsoN, CHARLES R. PAIus. Witnesses for Roesch: M. H. Locxwooo, JOHN A. KnHLnNnnoK.

Copies of this patent may be obtained for ve cents eaioh, by addressing the Commissioner of Eatentn,

Washington, D. G." 

